OpenWRT compilation error

Hi

I try to compile Frank’s openwrt (https://www.github.com/frank-w/openwrt) but got error:

    WARNING: Makefile 'package/feeds/telephony/sipgrep/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/packages/slang2/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/telephony/sngrep/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/packages/snort/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/packages/snort3/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/packages/sslh/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/packages/sslh/Makefile' has a dependency on 'libpcre', which does not exist
    WARNING: Makefile 'package/feeds/packages/syslog-ng/Makefile' has a dependency on 'libpcre', which does not exist

and during compilation:

checking for libpcre support... configure: error: Unable to use libpcre (libpcre check failed)

I have done feeds update and install. The same behavior I have on original opernwrt v19.07.4 branch

Please help

Thanks, Marcin